/* 当页面的宽度大于等于750px时，强制把html的字体大小改成75px，因为我们的设计稿是750px，然后化成10等分就是75px */
@media screen and (min-width: 750px) {
  html {
    font-size: 75px !important;
  }
}

* {
  margin: 0;
  padding: 0;
}
body {
  margin: 0 auto;
  width: 100%;
  max-width: 750px;
  min-width: 320px;
  background-color: #fff;
  font-size: 14px;
  font-family: -apple-system, Helvetica, sans-serif;
  line-height: 1.5;
  color: #666;
  /* 隐藏水平滚动条 */
  overflow-x: hidden;
  /* 长按元素时背景透明 */
  -webkit-tap-highlight-color: transparent;
}
div,
input {
  box-sizing: border-box;
}
ul {
  list-style: none;
}
a {
  text-decoration: none;
  color: #666;
}
img {
  width: 100%;
  height: 100%;
  vertical-align: top;
}
.fl {
  float: left;
}
.fr {
  float: right;
}
.clearfix::after {
  content: "";
  display: block;
  height: 0;
  clear: both;
  visibility: hidden;
}
.clearfix {
  zoom: 1;
}
